Xeranthemum (Immortelle) in Zone 3a & 3b
Xeranthemum annuum
When to plant xeranthemum (immortelle) in zone 3b
Zones 3a and 3b share the same average frost dates in our data, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Xeranthemum (Immortelle) tolerates either.
| Start indoors | Apr 18–Apr 25 |
|---|---|
| Direct sow / transplant outside | May 30–Jun 6 |
| Estimated bloom | Aug 23–Aug 30 (~85 days after planting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1.5-2 ft.
Xeranthemum, also called immortelle or paper flower, is a papery-petaled daisy relative that holds its color remarkably well once dried, which is the entire reason it's grown.
How xeranthemum (immortelle) fits zone 3's season
Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Xeranthemum (Immortelle) needs about 85 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Xeranthemum (Immortelle).
Where to buy xeranthemum seeds
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See it growing
Search YouTube for "growing xeranthemum (immortelle)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 3b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Xeranthemum (Immortelle) in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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